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</pre><pre class="rust ">
<span class="comment">// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">borrow</span>::<span class="ident">Cow</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashMap</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">hash_map</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Index</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>::<span class="ident">FromStr</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Arc</span>;

<span class="kw">use</span> <span class="ident">memchr</span>::<span class="ident">memchr</span>;

<span class="kw">use</span> <span class="ident">exec</span>::{<span class="ident">Exec</span>, <span class="ident">ExecNoSync</span>};
<span class="kw">use</span> <span class="ident">expand</span>::<span class="ident">expand</span>;
<span class="kw">use</span> <span class="ident">error</span>::<span class="ident">Error</span>;
<span class="kw">use</span> <span class="ident">re_builder</span>::<span class="ident">bytes</span>::<span class="ident">RegexBuilder</span>;
<span class="kw">use</span> <span class="ident">re_trait</span>::{<span class="self">self</span>, <span class="ident">RegularExpression</span>, <span class="ident">Slot</span>};

<span class="doccomment">/// A compiled regular expression for matching arbitrary bytes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It can be used to search, split or replace text. All searching is done with</span>
<span class="doccomment">/// an implicit `.*?` at the beginning and end of an expression. To force an</span>
<span class="doccomment">/// expression to match the whole string (or a prefix or a suffix), you must</span>
<span class="doccomment">/// use an anchor like `^` or `$` (or `\A` and `\z`).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Like the `Regex` type in the parent module, matches with this regex return</span>
<span class="doccomment">/// byte offsets into the search text. **Unlike** the parent `Regex` type,</span>
<span class="doccomment">/// these byte offsets may not correspond to UTF-8 sequence boundaries since</span>
<span class="doccomment">/// the regexes in this module can match arbitrary bytes.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Regex</span>(<span class="ident">Exec</span>);

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Regex</span> {
    <span class="doccomment">/// Shows the original regular expression.</span>
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;{}&quot;</span>, <span class="self">self</span>.<span class="ident">as_str</span>())
    }
}

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Regex</span> {
    <span class="doccomment">/// Shows the original regular expression.</span>
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="ident">fmt</span>::<span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="self">self</span>, <span class="ident">f</span>)
    }
}

<span class="doccomment">/// A constructor for Regex from an Exec.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is hidden because Exec isn&#39;t actually part of the public API.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">impl</span> <span class="ident">From</span><span class="op">&lt;</span><span class="ident">Exec</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Regex</span> {
    <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">exec</span>: <span class="ident">Exec</span>) <span class="op">-&gt;</span> <span class="ident">Regex</span> {
        <span class="ident">Regex</span>(<span class="ident">exec</span>)
    }
}

<span class="kw">impl</span> <span class="ident">FromStr</span> <span class="kw">for</span> <span class="ident">Regex</span> {
    <span class="kw">type</span> <span class="prelude-val">Err</span> <span class="op">=</span> <span class="ident">Error</span>;

    <span class="doccomment">/// Attempts to parse a string into a regular expression</span>
    <span class="kw">fn</span> <span class="ident">from_str</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Regex</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
        <span class="ident">Regex</span>::<span class="ident">new</span>(<span class="ident">s</span>)
    }
}

<span class="kw">impl</span> <span class="ident">Regex</span> {
    <span class="doccomment">/// Compiles a regular expression. Once compiled, it can be used repeatedly</span>
    <span class="doccomment">/// to search, split or replace text in a string.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// If an invalid expression is given, then an error is returned.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">re</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Regex</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
        <span class="ident">Regex</span>::<span class="ident">with_size_limit</span>(<span class="number">10</span> <span class="op">*</span> (<span class="number">1</span> <span class="op">&lt;&lt;</span> <span class="number">20</span>), <span class="ident">re</span>)
    }

    <span class="doccomment">/// Compiles a regular expression with the given size limit.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The size limit is applied to the size of the *compiled* data structure.</span>
    <span class="doccomment">/// If the data structure exceeds the size given, then an error is</span>
    <span class="doccomment">/// returned.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_size_limit</span>(<span class="ident">size</span>: <span class="ident">usize</span>, <span class="ident">re</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Regex</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
        <span class="ident">RegexBuilder</span>::<span class="ident">new</span>(<span class="ident">re</span>).<span class="ident">size_limit</span>(<span class="ident">size</span>).<span class="ident">compile</span>()
    }

    <span class="doccomment">/// Returns true if and only if the regex matches the string given.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// It is recommended to use this method if all you need to do is test</span>
    <span class="doccomment">/// a match, since the underlying matching engine may be able to do less</span>
    <span class="doccomment">/// work.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// # Example</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Test if some text contains at least one word with exactly 13 ASCII word</span>
    <span class="doccomment">/// bytes:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// ```rust</span>
    <span class="doccomment">/// # extern crate regex; use regex::bytes::Regex;</span>
    <span class="doccomment">/// # fn main() {</span>
    <span class="doccomment">/// let text = b&quot;I categorically deny having triskaidekaphobia.&quot;;</span>
    <span class="doccomment">/// assert!(Regex::new(r&quot;\b\w{13}\b&quot;).unwrap().is_match(text));</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_match</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">is_match_at</span>(<span class="ident">text</span>, <span class="number">0</span>)
    }

    <span class="doccomment">/// Returns the same as is_match, but starts the search at the given</span>
    <span class="doccomment">/// offset.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The significance of the starting point is that it takes the surrounding</span>
    <span class="doccomment">/// context into consideration. For example, the `\A` anchor can only</span>
    <span class="doccomment">/// match when `start == 0`.</span>
    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_match_at</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>], <span class="ident">start</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">shortest_match_at</span>(<span class="ident">text</span>, <span class="ident">start</span>).<span class="ident">is_some</span>()
    }

    <span class="doccomment">/// Returns the start and end byte range of the leftmost-first match in</span>
    <span class="doccomment">/// `text`. If no match exists, then `None` is returned.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Note that this should only be used if you want to discover the position</span>
    <span class="doccomment">/// of the match. Testing the existence of a match is faster if you use</span>
    <span class="doccomment">/// `is_match`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// # Example</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Find the start and end location of the first word with exactly 13</span>
    <span class="doccomment">/// ASCII word bytes:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// ```rust</span>
    <span class="doccomment">/// # extern crate regex; use regex::bytes::Regex;</span>
    <span class="doccomment">/// # fn main() {</span>
    <span class="doccomment">/// let text = b&quot;I categorically deny having triskaidekaphobia.&quot;;</span>
    <span class="doccomment">/// let pos = Regex::new(r&quot;\b\w{13}\b&quot;).unwrap().find(text);</span>
    <span class="doccomment">/// assert_eq!(pos, Some((2, 15)));</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">find</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">find_at</span>(<span class="ident">text</span>, <span class="number">0</span>)
    }

    <span class="doccomment">/// Returns the same as find, but starts the search at the given</span>
    <span class="doccomment">/// offset.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The significance of the starting point is that it takes the surrounding</span>
    <span class="doccomment">/// context into consideration. For example, the `\A` anchor can only</span>
    <span class="doccomment">/// match when `start == 0`.</span>
    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">find_at</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>],
        <span class="ident">start</span>: <span class="ident">usize</span>,
    ) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">searcher</span>().<span class="ident">find_at</span>(<span class="ident">text</span>, <span class="ident">start</span>)
    }

    <span class="doccomment">/// Returns an iterator for each successive non-overlapping match in</span>
    <span class="doccomment">/// `text`, returning the start and end byte indices with respect to</span>
    <span class="doccomment">/// `text`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// # Example</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Find the start and end location of every word with exactly 13 ASCII</span>
    <span class="doccomment">/// word bytes:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// ```rust</span>
    <span class="doccomment">/// # extern crate regex; use regex::bytes::Regex;</span>
    <span class="doccomment">/// # fn main() {</span>
    <span class="doccomment">/// let text = b&quot;Retroactively relinquishing remunerations is reprehensible.&quot;;</span>
    <span class="doccomment">/// for pos in Regex::new(r&quot;\b\w{13}\b&quot;).unwrap().find_iter(text) {</span>
    <span class="doccomment">///     println!(&quot;{:?}&quot;, pos);</span>
    <span class="doccomment">/// }</span>
    <span class="doccomment">/// // Output:</span>
    <span class="doccomment">/// // (0, 13)</span>
    <span class="doccomment">/// // (14, 27)</span>
    <span class="doccomment">/// // (28, 41)</span>
    <span class="doccomment">/// // (45, 58)</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">find_iter</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;r</span> <span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="ident">FindMatches</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
        <span class="ident">FindMatches</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">searcher</span>().<span class="ident">find_iter</span>(<span class="ident">text</span>))
    }

    <span class="doccomment">/// Returns the capture groups corresponding to the leftmost-first</span>
    <span class="doccomment">/// match in `text`. Capture group `0` always corresponds to the entire</span>
    <span class="doccomment">/// match. If no match is found, then `None` is returned.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// You should only use `captures` if you need access to submatches.</span>
    <span class="doccomment">/// Otherwise, `find` is faster for discovering the location of the overall</span>
    <span class="doccomment">/// match.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// # Examples</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Say you have some text with movie names and their release years,</span>
    <span class="doccomment">/// like &quot;&#39;Citizen Kane&#39; (1941)&quot;. It&#39;d be nice if we could search for text</span>
    <span class="doccomment">/// looking like that, while also extracting the movie name and its release</span>
    <span class="doccomment">/// year separately.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// ```rust</span>
    <span class="doccomment">/// # extern crate regex; use regex::bytes::Regex;</span>
    <span class="doccomment">/// # fn main() {</span>
    <span class="doccomment">/// let re = Regex::new(r&quot;&#39;([^&#39;]+)&#39;\s+\((\d{4})\)&quot;).unwrap();</span>
    <span class="doccomment">/// let text = b&quot;Not my favorite movie: &#39;Citizen Kane&#39; (1941).&quot;;</span>
    <span class="doccomment">/// let caps = re.captures(text).unwrap();</span>
    <span class="doccomment">/// assert_eq!(caps.at(1), Some(&amp;b&quot;Citizen Kane&quot;[..]));</span>
    <span class="doccomment">/// assert_eq!(caps.at(2), Some(&amp;b&quot;1941&quot;[..]));</span>
    <span class="doccomment">/// assert_eq!(caps.at(0), Some(&amp;b&quot;&#39;Citizen Kane&#39; (1941)&quot;[..]));</span>
    <span class="doccomment">/// // You can also access the groups by index using the Index notation.</span>
    <span class="doccomment">/// // Note that this will panic on an invalid index.</span>
    <span class="doccomment">/// assert_eq!(&amp;caps[1], b&quot;Citizen Kane&quot;);</span>
    <span class="doccomment">/// assert_eq!(&amp;caps[2], b&quot;1941&quot;);</span>
    <span class="doccomment">/// assert_eq!(&amp;caps[0], b&quot;&#39;Citizen Kane&#39; (1941)&quot;);</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Note that the full match is at capture group `0`. Each subsequent</span>
    <span class="doccomment">/// capture group is indexed by the order of its opening `(`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// We can make this example a bit clearer by using *named* capture groups:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// ```rust</span>
    <span class="doccomment">/// # extern crate regex; use regex::bytes::Regex;</span>
    <span class="doccomment">/// # fn main() {</span>
    <span class="doccomment">/// let re = Regex::new(r&quot;&#39;(?P&lt;title&gt;[^&#39;]+)&#39;\s+\((?P&lt;year&gt;\d{4})\)&quot;)</span>
    <span class="doccomment">///                .unwrap();</span>
    <span class="doccomment">/// let text = b&quot;Not my favorite movie: &#39;Citizen Kane&#39; (1941).&quot;;</span>
    <span class="doccomment">/// let caps = re.captures(text).unwrap();</span>
    <span class="doccomment">/// assert_eq!(caps.name(&quot;title&quot;), Some(&amp;b&quot;Citizen Kane&quot;[..]));</span>
    <span class="doccomment">/// assert_eq!(caps.name(&quot;year&quot;), Some(&amp;b&quot;1941&quot;[..]));</span>
    <span class="doccomment">/// assert_eq!(caps.at(0), Some(&amp;b&quot;&#39;Citizen Kane&#39; (1941)&quot;[..]));</span>
    <span class="doccomment">/// // You can also access the groups by name using the Index notation.</span>
    <span class="doccomment">/// // Note that this will panic on an invalid group name.</span>
    <span class="doccomment">/// assert_eq!(&amp;caps[&quot;title&quot;], b&quot;Citizen Kane&quot;);</span>
    <span class="doccomment">/// assert_eq!(&amp;caps[&quot;year&quot;], b&quot;1941&quot;);</span>
    <span class="doccomment">/// assert_eq!(&amp;caps[0], b&quot;&#39;Citizen Kane&#39; (1941)&quot;);</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Here we name the capture groups, which we can access with the `name`</span>
    <span class="doccomment">/// method or the `Index` notation with a `&amp;str`. Note that the named</span>
    <span class="doccomment">/// capture groups are still accessible with `at` or the `Index` notation</span>
    <span class="doccomment">/// with a `usize`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The `0`th capture group is always unnamed, so it must always be</span>
    <span class="doccomment">/// accessed with `at(0)` or `[0]`.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">captures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Captures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">slots</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="prelude-val">None</span>; <span class="number">2</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">captures_len</span>()];
        <span class="self">self</span>.<span class="ident">read_captures_at</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">slots</span>, <span class="ident">text</span>, <span class="number">0</span>).<span class="ident">map</span>(<span class="op">|</span>_<span class="op">|</span> <span class="ident">Captures</span> {
            <span class="ident">text</span>: <span class="ident">text</span>,
            <span class="ident">slots</span>: <span class="ident">slots</span>,
            <span class="ident">named_groups</span>: <span class="self">self</span>.<span class="number">0</span>.<span class="ident">capture_name_idx</span>().<span class="ident">clone</span>(),
        })
    }

    <span class="doccomment">/// Returns the same as captures, but starts the search at the given</span>
    <span class="doccomment">/// offset and populates the capture locations given.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The significance of the starting point is that it takes the surrounding</span>
    <span class="doccomment">/// context into consideration. For example, the `\A` anchor can only</span>
    <span class="doccomment">/// match when `start == 0`.</span>
    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read_captures_at</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">slots</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">Slot</span>],
        <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>],
        <span class="ident">start</span>: <span class="ident">usize</span>,
    ) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">searcher</span>().<span class="ident">read_captures_at</span>(<span class="ident">slots</span>, <span class="ident">text</span>, <span class="ident">start</span>)
    }

    <span class="doccomment">/// Returns an iterator over all the non-overlapping capture groups matched</span>
    <span class="doccomment">/// in `text`. This is operationally the same as `find_iter`, except it</span>
    <span class="doccomment">/// yields information about submatches.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// # Example</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// We can use this to find all movie titles and their release years in</span>
    <span class="doccomment">/// some text, where the movie is formatted like &quot;&#39;Title&#39; (xxxx)&quot;:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// ```rust</span>
    <span class="doccomment">/// # extern crate regex; use std::str; use regex::bytes::Regex;</span>
    <span class="doccomment">/// # fn main() {</span>
    <span class="doccomment">/// let re = Regex::new(r&quot;&#39;(?P&lt;title&gt;[^&#39;]+)&#39;\s+\((?P&lt;year&gt;\d{4})\)&quot;)</span>
    <span class="doccomment">///                .unwrap();</span>
    <span class="doccomment">/// let text = b&quot;&#39;Citizen Kane&#39; (1941), &#39;The Wizard of Oz&#39; (1939), &#39;M&#39; (1931).&quot;;</span>
    <span class="doccomment">/// for caps in re.captures_iter(text) {</span>
    <span class="doccomment">///     let title = str::from_utf8(&amp;caps[&quot;title&quot;]).unwrap();</span>
    <span class="doccomment">///     let year = str::from_utf8(&amp;caps[&quot;year&quot;]).unwrap();</span>
    <span class="doccomment">///     println!(&quot;Movie: {:?}, Released: {:?}&quot;, title, year);</span>
    <span class="doccomment">/// }</span>
    <span class="doccomment">/// // Output:</span>
    <span class="doccomment">/// // Movie: Citizen Kane, Released: 1941</span>
    <span class="doccomment">/// // Movie: The Wizard of Oz, Released: 1939</span>
    <span class="doccomment">/// // Movie: M, Released: 1931</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">captures_iter</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span>(
        <span class="kw-2">&amp;</span><span class="lifetime">&#39;r</span> <span class="self">self</span>,
        <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>],
    ) <span class="op">-&gt;</span> <span class="ident">FindCaptures</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
        <span class="ident">FindCaptures</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">searcher</span>().<span class="ident">captures_iter</span>(<span class="ident">text</span>))
    }

    <span class="doccomment">/// Returns an iterator of substrings of `text` delimited by a match of the</span>
    <span class="doccomment">/// regular expression. Namely, each element of the iterator corresponds to</span>
    <span class="doccomment">/// text that *isn&#39;t* matched by the regular expression.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This method will *not* copy the text given.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// # Example</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// To split a string delimited by arbitrary amounts of spaces or tabs:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// ```rust</span>
    <span class="doccomment">/// # extern crate regex; use regex::bytes::Regex;</span>
    <span class="doccomment">/// # fn main() {</span>
    <span class="doccomment">/// let re = Regex::new(r&quot;[ \t]+&quot;).unwrap();</span>
    <span class="doccomment">/// let fields: Vec&lt;&amp;[u8]&gt; = re.split(b&quot;a b \t  c\td    e&quot;).collect();</span>
    <span class="doccomment">/// assert_eq!(fields, vec![</span>
    <span class="doccomment">///     &amp;b&quot;a&quot;[..], &amp;b&quot;b&quot;[..], &amp;b&quot;c&quot;[..], &amp;b&quot;d&quot;[..], &amp;b&quot;e&quot;[..],</span>
    <span class="doccomment">/// ]);</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">split</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;r</span> <span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="ident">Splits</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
        <span class="ident">Splits</span> {
            <span class="ident">finder</span>: <span class="self">self</span>.<span class="ident">find_iter</span>(<span class="ident">text</span>),
            <span class="ident">last</span>: <span class="number">0</span>,
        }
    }

    <span class="doccomment">/// Returns an iterator of at most `limit` substrings of `text` delimited</span>
    <span class="doccomment">/// by a match of the regular expression. (A `limit` of `0` will return no</span>
    <span class="doccomment">/// substrings.) Namely, each element of the iterator corresponds to text</span>
    <span class="doccomment">/// that *isn&#39;t* matched by the regular expression. The remainder of the</span>
    <span class="doccomment">/// string that is not split will be the last element in the iterator.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This method will *not* copy the text given.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// # Example</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Get the first two words in some text:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// ```rust</span>
    <span class="doccomment">/// # extern crate regex; use regex::bytes::Regex;</span>
    <span class="doccomment">/// # fn main() {</span>
    <span class="doccomment">/// let re = Regex::new(r&quot;\W+&quot;).unwrap();</span>
    <span class="doccomment">/// let fields: Vec&lt;&amp;[u8]&gt; = re.splitn(b&quot;Hey! How are you?&quot;, 3).collect();</span>
    <span class="doccomment">/// assert_eq!(fields, vec![&amp;b&quot;Hey&quot;[..], &amp;b&quot;How&quot;[..], &amp;b&quot;are you?&quot;[..]]);</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">splitn</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span>(
        <span class="kw-2">&amp;</span><span class="lifetime">&#39;r</span> <span class="self">self</span>,
        <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>],
        <span class="ident">limit</span>: <span class="ident">usize</span>,
    ) <span class="op">-&gt;</span> <span class="ident">SplitsN</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
        <span class="ident">SplitsN</span> {
            <span class="ident">splits</span>: <span class="self">self</span>.<span class="ident">split</span>(<span class="ident">text</span>),
            <span class="ident">n</span>: <span class="ident">limit</span>,
        }
    }

    <span class="doccomment">/// Replaces the leftmost-first match with the replacement provided. The</span>
    <span class="doccomment">/// replacement can be a regular byte string (where `$N` and `$name` are</span>
    <span class="doccomment">/// expanded to match capture groups) or a function that takes the matches&#39;</span>
    <span class="doccomment">/// `Captures` and returns the replaced byte string.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// If no match is found, then a copy of the byte string is returned</span>
    <span class="doccomment">/// unchanged.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// # Examples</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Note that this function is polymorphic with respect to the replacement.</span>
    <span class="doccomment">/// In typical usage, this can just be a normal byte string:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// ```rust</span>
    <span class="doccomment">/// # extern crate regex; use regex::bytes::Regex;</span>
    <span class="doccomment">/// # fn main() {</span>
    <span class="doccomment">/// let re = Regex::new(&quot;[^01]+&quot;).unwrap();</span>
    <span class="doccomment">/// assert_eq!(re.replace(b&quot;1078910&quot;, &amp;b&quot;&quot;[..]), b&quot;1010&quot;);</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// But anything satisfying the `Replacer` trait will work. For example, a</span>
    <span class="doccomment">/// closure of type `|&amp;Captures| -&gt; Vec&lt;u8&gt;` provides direct access to the</span>
    <span class="doccomment">/// captures corresponding to a match. This allows one to access submatches</span>
    <span class="doccomment">/// easily:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// ```rust</span>
    <span class="doccomment">/// # extern crate regex; use regex::bytes::Regex;</span>
    <span class="doccomment">/// # use regex::bytes::Captures; fn main() {</span>
    <span class="doccomment">/// let re = Regex::new(r&quot;([^,\s]+),\s+(\S+)&quot;).unwrap();</span>
    <span class="doccomment">/// let result = re.replace(b&quot;Springsteen, Bruce&quot;, |caps: &amp;Captures| {</span>
    <span class="doccomment">///     let mut replacement = caps[2].to_owned();</span>
    <span class="doccomment">///     replacement.push(b&#39; &#39;);</span>
    <span class="doccomment">///     replacement.extend(&amp;caps[1]);</span>
    <span class="doccomment">///     replacement</span>
    <span class="doccomment">/// });</span>
    <span class="doccomment">/// assert_eq!(result, b&quot;Bruce Springsteen&quot;);</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// But this is a bit cumbersome to use all the time. Instead, a simple</span>
    <span class="doccomment">/// syntax is supported that expands `$name` into the corresponding capture</span>
    <span class="doccomment">/// group. Here&#39;s the last example, but using this expansion technique</span>
    <span class="doccomment">/// with named capture groups:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// ```rust</span>
    <span class="doccomment">/// # extern crate regex; use regex::bytes::Regex;</span>
    <span class="doccomment">/// # fn main() {</span>
    <span class="doccomment">/// let re = Regex::new(r&quot;(?P&lt;last&gt;[^,\s]+),\s+(?P&lt;first&gt;\S+)&quot;).unwrap();</span>
    <span class="doccomment">/// let result = re.replace(b&quot;Springsteen, Bruce&quot;, &amp;b&quot;$first $last&quot;[..]);</span>
    <span class="doccomment">/// assert_eq!(result, b&quot;Bruce Springsteen&quot;);</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Note that using `$2` instead of `$first` or `$1` instead of `$last`</span>
    <span class="doccomment">/// would produce the same result. To write a literal `$` use `$$`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// If `$name` isn&#39;t a valid capture group (whether the name doesn&#39;t exist</span>
    <span class="doccomment">/// or isn&#39;t a valid index), then it is replaced with the empty string.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The longest possible name is used. e.g., `$1a` looks up the capture</span>
    <span class="doccomment">/// group named `1a` and not the capture group at index `1`. To exert more</span>
    <span class="doccomment">/// precise control over the name, use braces, e.g., `${1}a`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Finally, sometimes you just want to replace a literal string with no</span>
    <span class="doccomment">/// submatch expansion. This can be done by wrapping a byte string with</span>
    <span class="doccomment">/// `NoExpand`:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// ```rust</span>
    <span class="doccomment">/// # extern crate regex; use regex::bytes::Regex;</span>
    <span class="doccomment">/// # fn main() {</span>
    <span class="doccomment">/// use regex::bytes::NoExpand;</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// let re = Regex::new(r&quot;(?P&lt;last&gt;[^,\s]+),\s+(\S+)&quot;).unwrap();</span>
    <span class="doccomment">/// let result = re.replace(b&quot;Springsteen, Bruce&quot;, NoExpand(b&quot;$2 $last&quot;));</span>
    <span class="doccomment">/// assert_eq!(result, b&quot;$2 $last&quot;);</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">replace</span><span class="op">&lt;</span><span class="ident">R</span>: <span class="ident">Replacer</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>], <span class="ident">rep</span>: <span class="ident">R</span>) <span class="op">-&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">replacen</span>(<span class="ident">text</span>, <span class="number">1</span>, <span class="ident">rep</span>)
    }

    <span class="doccomment">/// Replaces all non-overlapping matches in `text` with the replacement</span>
    <span class="doccomment">/// provided. This is the same as calling `replacen` with `limit` set to</span>
    <span class="doccomment">/// `0`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// See the documentation for `replace` for details on how to access</span>
    <span class="doccomment">/// submatches in the replacement text.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">replace_all</span><span class="op">&lt;</span><span class="ident">R</span>: <span class="ident">Replacer</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>], <span class="ident">rep</span>: <span class="ident">R</span>) <span class="op">-&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">replacen</span>(<span class="ident">text</span>, <span class="number">0</span>, <span class="ident">rep</span>)
    }

    <span class="doccomment">/// Replaces at most `limit` non-overlapping matches in `text` with the</span>
    <span class="doccomment">/// replacement provided. If `limit` is 0, then all non-overlapping matches</span>
    <span class="doccomment">/// are replaced.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// See the documentation for `replace` for details on how to access</span>
    <span class="doccomment">/// submatches in the replacement text.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">replacen</span><span class="op">&lt;</span><span class="ident">R</span>: <span class="ident">Replacer</span><span class="op">&gt;</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>],
        <span class="ident">limit</span>: <span class="ident">usize</span>,
        <span class="kw-2">mut</span> <span class="ident">rep</span>: <span class="ident">R</span>,
    ) <span class="op">-&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">rep</span>) <span class="op">=</span> <span class="ident">rep</span>.<span class="ident">no_expansion</span>() {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">new</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">text</span>.<span class="ident">len</span>());
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">last_match</span> <span class="op">=</span> <span class="number">0</span>;
            <span class="kw">for</span> (<span class="ident">i</span>, (<span class="ident">s</span>, <span class="ident">e</span>)) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">find_iter</span>(<span class="ident">text</span>).<span class="ident">enumerate</span>() {
                <span class="kw">if</span> <span class="ident">limit</span> <span class="op">&gt;</span> <span class="number">0</span> <span class="op">&amp;&amp;</span> <span class="ident">i</span> <span class="op">&gt;=</span> <span class="ident">limit</span> {
                    <span class="kw">break</span>
                }
                <span class="ident">extend_from_slice</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">new</span>, <span class="kw-2">&amp;</span><span class="ident">text</span>[<span class="ident">last_match</span>..<span class="ident">s</span>]);
                <span class="ident">extend_from_slice</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">new</span>, <span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="ident">rep</span>);
                <span class="ident">last_match</span> <span class="op">=</span> <span class="ident">e</span>;
            }
            <span class="ident">extend_from_slice</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">new</span>, <span class="kw-2">&amp;</span><span class="ident">text</span>[<span class="ident">last_match</span>..]);
            <span class="kw">return</span> <span class="ident">new</span>;
        }

        <span class="comment">// The slower path, which we use if the replacement needs access to</span>
        <span class="comment">// capture groups.</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">new</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">text</span>.<span class="ident">len</span>());
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">last_match</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">cap</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">captures_iter</span>(<span class="ident">text</span>).<span class="ident">enumerate</span>() {
            <span class="kw">if</span> <span class="ident">limit</span> <span class="op">&gt;</span> <span class="number">0</span> <span class="op">&amp;&amp;</span> <span class="ident">i</span> <span class="op">&gt;=</span> <span class="ident">limit</span> {
                <span class="kw">break</span>
            }
            <span class="comment">// unwrap on 0 is OK because captures only reports matches</span>
            <span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">e</span>) <span class="op">=</span> <span class="ident">cap</span>.<span class="ident">pos</span>(<span class="number">0</span>).<span class="ident">unwrap</span>();
            <span class="ident">extend_from_slice</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">new</span>, <span class="kw-2">&amp;</span><span class="ident">text</span>[<span class="ident">last_match</span>..<span class="ident">s</span>]);
            <span class="ident">rep</span>.<span class="ident">replace_append</span>(<span class="kw-2">&amp;</span><span class="ident">cap</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">new</span>);
            <span class="ident">last_match</span> <span class="op">=</span> <span class="ident">e</span>;
        }
        <span class="ident">extend_from_slice</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">new</span>, <span class="kw-2">&amp;</span><span class="ident">text</span>[<span class="ident">last_match</span>..]);
        <span class="ident">new</span>
    }

    <span class="doccomment">/// Returns the end location of a match in the text given.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This method may have the same performance characteristics as</span>
    <span class="doccomment">/// `is_match`, except it provides an end location for a match. In</span>
    <span class="doccomment">/// particular, the location returned *may be shorter* than the proper end</span>
    <span class="doccomment">/// of the leftmost-first match.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// # Example</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Typically, `a+` would match the entire first sequence of `a` in some</span>
    <span class="doccomment">/// text, but `shortest_match` can give up as soon as it sees the first</span>
    <span class="doccomment">/// `a`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// ```rust</span>
    <span class="doccomment">/// # extern crate regex; use regex::bytes::Regex;</span>
    <span class="doccomment">/// # fn main() {</span>
    <span class="doccomment">/// let text = b&quot;aaaaa&quot;;</span>
    <span class="doccomment">/// let pos = Regex::new(r&quot;a+&quot;).unwrap().shortest_match(text);</span>
    <span class="doccomment">/// assert_eq!(pos, Some(1));</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">shortest_match</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">shortest_match_at</span>(<span class="ident">text</span>, <span class="number">0</span>)
    }

    <span class="doccomment">/// Returns the same as shortest_match, but starts the search at the given</span>
    <span class="doccomment">/// offset.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The significance of the starting point is that it takes the surrounding</span>
    <span class="doccomment">/// context into consideration. For example, the `\A` anchor can only</span>
    <span class="doccomment">/// match when `start == 0`.</span>
    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">shortest_match_at</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>],
        <span class="ident">start</span>: <span class="ident">usize</span>,
    ) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">searcher</span>().<span class="ident">shortest_match_at</span>(<span class="ident">text</span>, <span class="ident">start</span>)
    }

    <span class="doccomment">/// Returns the original string of this regex.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_str</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">str</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>.<span class="ident">regex_strings</span>()[<span class="number">0</span>]
    }

    <span class="doccomment">/// Returns an iterator over the capture names.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">capture_names</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">CaptureNames</span> {
        <span class="ident">CaptureNames</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">capture_names</span>().<span class="ident">iter</span>())
    }

    <span class="doccomment">/// Returns the number of captures.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">captures_len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">capture_names</span>().<span class="ident">len</span>()
    }
}

<span class="doccomment">/// An iterator over all non-overlapping matches for a particular string.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The iterator yields a tuple of integers corresponding to the start and end</span>
<span class="doccomment">/// of the match. The indices are byte offsets. The iterator stops when no more</span>
<span class="doccomment">/// matches can be found.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;r` is the lifetime of the compiled regular expression and `&#39;t` is the</span>
<span class="doccomment">/// lifetime of the matched byte string.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FindMatches</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span>(<span class="ident">re_trait</span>::<span class="ident">FindMatches</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="ident">ExecNoSync</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span><span class="op">&gt;&gt;</span>);

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">FindMatches</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> (<span class="ident">usize</span>, <span class="ident">usize</span>);

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">next</span>()
    }
}

<span class="doccomment">/// An iterator that yields all non-overlapping capture groups matching a</span>
<span class="doccomment">/// particular regular expression.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The iterator stops when no more matches can be found.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;r` is the lifetime of the compiled regular expression and `&#39;t` is the</span>
<span class="doccomment">/// lifetime of the matched byte string.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FindCaptures</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span>(<span class="ident">re_trait</span>::<span class="ident">FindCaptures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="ident">ExecNoSync</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span><span class="op">&gt;&gt;</span>);

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">FindCaptures</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Captures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span>;

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Captures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;&gt;</span> {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">slots</span><span class="op">|</span> <span class="ident">Captures</span> {
            <span class="ident">text</span>: <span class="self">self</span>.<span class="number">0</span>.<span class="ident">text</span>(),
            <span class="ident">slots</span>: <span class="ident">slots</span>,
            <span class="ident">named_groups</span>: <span class="self">self</span>.<span class="number">0</span>.<span class="ident">regex</span>().<span class="ident">capture_name_idx</span>().<span class="ident">clone</span>(),
        })
    }
}

<span class="doccomment">/// Yields all substrings delimited by a regular expression match.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;r` is the lifetime of the compiled regular expression and `&#39;t` is the</span>
<span class="doccomment">/// lifetime of the byte string being split.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Splits</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="ident">finder</span>: <span class="ident">FindMatches</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span>,
    <span class="ident">last</span>: <span class="ident">usize</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Splits</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>];

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>]<span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">text</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">finder</span>.<span class="number">0</span>.<span class="ident">text</span>();
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">finder</span>.<span class="ident">next</span>() {
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> {
                <span class="kw">if</span> <span class="self">self</span>.<span class="ident">last</span> <span class="op">&gt;=</span> <span class="ident">text</span>.<span class="ident">len</span>() {
                    <span class="prelude-val">None</span>
                } <span class="kw">else</span> {
                    <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">text</span>[<span class="self">self</span>.<span class="ident">last</span>..];
                    <span class="self">self</span>.<span class="ident">last</span> <span class="op">=</span> <span class="ident">text</span>.<span class="ident">len</span>();
                    <span class="prelude-val">Some</span>(<span class="ident">s</span>)
                }
            }
            <span class="prelude-val">Some</span>((<span class="ident">s</span>, <span class="ident">e</span>)) <span class="op">=&gt;</span> {
                <span class="kw">let</span> <span class="ident">matched</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">text</span>[<span class="self">self</span>.<span class="ident">last</span>..<span class="ident">s</span>];
                <span class="self">self</span>.<span class="ident">last</span> <span class="op">=</span> <span class="ident">e</span>;
                <span class="prelude-val">Some</span>(<span class="ident">matched</span>)
            }
        }
    }
}

<span class="doccomment">/// Yields at most `N` substrings delimited by a regular expression match.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The last substring will be whatever remains after splitting.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;r` is the lifetime of the compiled regular expression and `&#39;t` is the</span>
<span class="doccomment">/// lifetime of the byte string being split.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SplitsN</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="ident">splits</span>: <span class="ident">Splits</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span>,
    <span class="ident">n</span>: <span class="ident">usize</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">SplitsN</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>];

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>]<span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">n</span> <span class="op">==</span> <span class="number">0</span> {
            <span class="kw">return</span> <span class="prelude-val">None</span>
        }
        <span class="self">self</span>.<span class="ident">n</span> <span class="op">-=</span> <span class="number">1</span>;
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">n</span> <span class="op">==</span> <span class="number">0</span> {
            <span class="kw">let</span> <span class="ident">text</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">splits</span>.<span class="ident">finder</span>.<span class="number">0</span>.<span class="ident">text</span>();
            <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="ident">text</span>[<span class="self">self</span>.<span class="ident">splits</span>.<span class="ident">last</span>..])
        } <span class="kw">else</span> {
            <span class="self">self</span>.<span class="ident">splits</span>.<span class="ident">next</span>()
        }
    }
}

<span class="doccomment">/// An iterator over the names of all possible captures.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `None` indicates an unnamed capture; the first element (capture 0, the</span>
<span class="doccomment">/// whole matched region) is always unnamed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;r` is the lifetime of the compiled regular expression.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CaptureNames</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span><span class="op">&gt;</span>(::<span class="ident">std</span>::<span class="ident">slice</span>::<span class="ident">Iter</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;&gt;</span>);

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">CaptureNames</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;r</span> <span class="ident">str</span><span class="op">&gt;</span>;

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;r</span> <span class="ident">str</span><span class="op">&gt;&gt;</span> {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">next</span>().<span class="ident">as_ref</span>()
            .<span class="ident">map</span>(<span class="op">|</span><span class="ident">slot</span><span class="op">|</span> <span class="ident">slot</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">name</span><span class="op">|</span> <span class="ident">name</span>.<span class="ident">as_ref</span>()))
    }

    <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>) {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">size_hint</span>()
    }
}

<span class="doccomment">/// Captures represents a group of captured byte strings for a single match.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The 0th capture always corresponds to the entire match. Each subsequent</span>
<span class="doccomment">/// index corresponds to the next capture group in the regex. If a capture</span>
<span class="doccomment">/// group is named, then the matched byte string is *also* available via the</span>
<span class="doccomment">/// `name` method. (Note that the 0th capture is always unnamed and so must be</span>
<span class="doccomment">/// accessed with the `at` method.)</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Positions returned from a capture group are always byte indices.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;t` is the lifetime of the matched text.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Captures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>],
    <span class="ident">slots</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;&gt;</span>,
    <span class="ident">named_groups</span>: <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">usize</span><span class="op">&gt;&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span> <span class="ident">Captures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Returns the start and end positions of the Nth capture group. Returns</span>
    <span class="doccomment">/// `None` if `i` is not a valid capture group or if the capture group did</span>
    <span class="doccomment">/// not match anything. The positions returned are *always* byte indices</span>
    <span class="doccomment">/// with respect to the original byte string matched.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pos</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;</span> {
        <span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">e</span>) <span class="op">=</span> (<span class="ident">i</span> <span class="op">*</span> <span class="number">2</span>, <span class="ident">i</span> <span class="op">*</span> <span class="number">2</span> <span class="op">+</span> <span class="number">1</span>);
        <span class="kw">match</span> (<span class="self">self</span>.<span class="ident">slots</span>.<span class="ident">get</span>(<span class="ident">s</span>), <span class="self">self</span>.<span class="ident">slots</span>.<span class="ident">get</span>(<span class="ident">e</span>)) {
            (<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="prelude-val">Some</span>(<span class="ident">s</span>)), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="prelude-val">Some</span>(<span class="ident">e</span>))) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>((<span class="ident">s</span>, <span class="ident">e</span>)),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>,
        }
    }

    <span class="doccomment">/// Returns the matched string for the capture group `i`.  If `i` isn&#39;t</span>
    <span class="doccomment">/// a valid capture group or didn&#39;t match anything, then `None` is</span>
    <span class="doccomment">/// returned.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">at</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>]<span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">pos</span>(<span class="ident">i</span>) {
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="prelude-val">None</span>,
            <span class="prelude-val">Some</span>((<span class="ident">s</span>, <span class="ident">e</span>)) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">text</span>[<span class="ident">s</span>..<span class="ident">e</span>])
        }
    }

    <span class="doccomment">/// Returns the matched string for the capture group named `name`.  If</span>
    <span class="doccomment">/// `name` isn&#39;t a valid capture group or didn&#39;t match anything, then</span>
    <span class="doccomment">/// `None` is returned.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">name</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>]<span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">named_groups</span>.<span class="ident">get</span>(<span class="ident">name</span>).<span class="ident">and_then</span>(<span class="op">|</span><span class="kw-2">&amp;</span><span class="ident">i</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">at</span>(<span class="ident">i</span>))
    }

    <span class="doccomment">/// Creates an iterator of all the capture groups in order of appearance</span>
    <span class="doccomment">/// in the regular expression.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">iter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">SubCaptures</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
        <span class="ident">SubCaptures</span> { <span class="ident">idx</span>: <span class="number">0</span>, <span class="ident">caps</span>: <span class="self">self</span> }
    }

    <span class="doccomment">/// Creates an iterator of all the capture group positions in order of</span>
    <span class="doccomment">/// appearance in the regular expression. Positions are byte indices</span>
    <span class="doccomment">/// in terms of the original string matched.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">iter_pos</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">SubCapturesPos</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
        <span class="ident">SubCapturesPos</span> { <span class="ident">idx</span>: <span class="number">0</span>, <span class="ident">slots</span>: <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">slots</span> }
    }

    <span class="doccomment">/// Creates an iterator of all named groups as an tuple with the group</span>
    <span class="doccomment">/// name and the value. The iterator returns these values in arbitrary</span>
    <span class="doccomment">/// order.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">iter_named</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">SubCapturesNamed</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
        <span class="ident">SubCapturesNamed</span> {
            <span class="ident">caps</span>: <span class="self">self</span>,
            <span class="ident">names</span>: <span class="self">self</span>.<span class="ident">named_groups</span>.<span class="ident">iter</span>()
        }
    }

    <span class="doccomment">/// Expands all instances of `$name` in `text` to the corresponding capture</span>
    <span class="doccomment">/// group `name`, and writes them to the `dst` buffer given.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// `name` may be an integer corresponding to the index of the</span>
    <span class="doccomment">/// capture group (counted by order of opening parenthesis where `0` is the</span>
    <span class="doccomment">/// entire match) or it can be a name (consisting of letters, digits or</span>
    <span class="doccomment">/// underscores) corresponding to a named capture group.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// If `name` isn&#39;t a valid capture group (whether the name doesn&#39;t exist</span>
    <span class="doccomment">/// or isn&#39;t a valid index), then it is replaced with the empty string.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The longest possible name is used. e.g., `$1a` looks up the capture</span>
    <span class="doccomment">/// group named `1a` and not the capture group at index `1`. To exert more</span>
    <span class="doccomment">/// precise control over the name, use braces, e.g., `${1}a`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// To write a literal `$` use `$$`.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">expand</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">replacement</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>], <span class="ident">dst</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>) {
        <span class="ident">expand</span>(<span class="self">self</span>, <span class="ident">replacement</span>, <span class="ident">dst</span>)
    }

    <span class="doccomment">/// Returns the number of captured groups.</span>
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">slots</span>.<span class="ident">len</span>() <span class="op">/</span> <span class="number">2</span>
    }

    <span class="doccomment">/// Returns true if and only if there are no captured groups.</span>
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span>
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Captures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">&quot;Captures&quot;</span>).<span class="ident">field</span>(<span class="kw-2">&amp;</span><span class="ident">CapturesDebug</span>(<span class="self">self</span>)).<span class="ident">finish</span>()
    }
}

<span class="kw">struct</span> <span class="ident">CapturesDebug</span><span class="op">&lt;</span><span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span>: <span class="lifetime">&#39;c</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;c</span> <span class="ident">Captures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span>);

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">CapturesDebug</span><span class="op">&lt;</span><span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="kw">fn</span> <span class="ident">escape_bytes</span>(<span class="ident">bytes</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="ident">String</span> {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
            <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="ident">b</span> <span class="kw">in</span> <span class="ident">bytes</span> {
                <span class="ident">s</span>.<span class="ident">push_str</span>(<span class="kw-2">&amp;</span><span class="ident">escape_byte</span>(<span class="ident">b</span>));
            }
            <span class="ident">s</span>
        }

        <span class="kw">fn</span> <span class="ident">escape_byte</span>(<span class="ident">byte</span>: <span class="ident">u8</span>) <span class="op">-&gt;</span> <span class="ident">String</span> {
            <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ascii</span>::<span class="ident">escape_default</span>;

            <span class="kw">let</span> <span class="ident">escaped</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">escape_default</span>(<span class="ident">byte</span>).<span class="ident">collect</span>();
            <span class="ident">String</span>::<span class="ident">from_utf8_lossy</span>(<span class="kw-2">&amp;</span><span class="ident">escaped</span>).<span class="ident">into_owned</span>()
        }

        <span class="comment">// We&#39;d like to show something nice here, even if it means an</span>
        <span class="comment">// allocation to build a reverse index.</span>
        <span class="kw">let</span> <span class="ident">slot_to_name</span>: <span class="ident">HashMap</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">usize</span>, <span class="kw-2">&amp;</span><span class="ident">String</span><span class="op">&gt;</span> <span class="op">=</span>
            <span class="self">self</span>.<span class="number">0</span>.<span class="ident">named_groups</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">a</span>, <span class="ident">b</span>)<span class="op">|</span> (<span class="ident">b</span>, <span class="ident">a</span>)).<span class="ident">collect</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">debug_map</span>();
        <span class="kw">for</span> (<span class="ident">slot</span>, <span class="ident">m</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">iter_pos</span>().<span class="ident">enumerate</span>() {
            <span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">s</span>, <span class="ident">e</span>)<span class="op">|</span> <span class="ident">escape_bytes</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>.<span class="ident">text</span>[<span class="ident">s</span>..<span class="ident">e</span>]));
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">name</span>) <span class="op">=</span> <span class="ident">slot_to_name</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="ident">slot</span>) {
                <span class="ident">map</span>.<span class="ident">entry</span>(<span class="kw-2">&amp;</span><span class="ident">name</span>, <span class="kw-2">&amp;</span><span class="ident">m</span>);
            } <span class="kw">else</span> {
                <span class="ident">map</span>.<span class="ident">entry</span>(<span class="kw-2">&amp;</span><span class="ident">slot</span>, <span class="kw-2">&amp;</span><span class="ident">m</span>);
            }
        }
        <span class="ident">map</span>.<span class="ident">finish</span>()
    }
}

<span class="doccomment">/// Get a group by index.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;t` is the lifetime of the matched text.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The text can&#39;t outlive the `Captures` object if this method is</span>
<span class="doccomment">/// used, because of how `Index` is defined (normally `a[i]` is part</span>
<span class="doccomment">/// of `a` and can&#39;t outlive it); to do that, use `at()` instead.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If there is no group at the given index.</span>
<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span> <span class="ident">Index</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Captures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> [<span class="ident">u8</span>];

    <span class="kw">fn</span> <span class="ident">index</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span>[<span class="ident">u8</span>] {
        <span class="self">self</span>.<span class="ident">at</span>(<span class="ident">i</span>).<span class="ident">unwrap_or_else</span>(<span class="op">||</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;no group at index &#39;{}&#39;&quot;</span>, <span class="ident">i</span>))
    }
}

<span class="doccomment">/// Get a group by name.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;t` is the lifetime of the matched text and `&#39;i` is the lifetime</span>
<span class="doccomment">/// of the group name (the index).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The text can&#39;t outlive the `Captures` object if this method is</span>
<span class="doccomment">/// used, because of how `Index` is defined (normally `a[i]` is part</span>
<span class="doccomment">/// of `a` and can&#39;t outlive it); to do that, use `name` instead.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If there is no group named by the given value.</span>
<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="lifetime">&#39;i</span><span class="op">&gt;</span> <span class="ident">Index</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;i</span> <span class="ident">str</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Captures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> [<span class="ident">u8</span>];

    <span class="kw">fn</span> <span class="ident">index</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;i</span> <span class="ident">str</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> [<span class="ident">u8</span>] {
        <span class="self">self</span>.<span class="ident">name</span>(<span class="ident">name</span>).<span class="ident">unwrap_or_else</span>(<span class="op">||</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;no group named &#39;{}&#39;&quot;</span>, <span class="ident">name</span>))
    }
}

<span class="doccomment">/// An iterator over capture groups for a particular match of a regular</span>
<span class="doccomment">/// expression.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;c` is the lifetime of the captures and `&#39;t` is the lifetime of the</span>
<span class="doccomment">/// matched text.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SubCaptures</span><span class="op">&lt;</span><span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span>: <span class="lifetime">&#39;c</span><span class="op">&gt;</span> {
    <span class="ident">idx</span>: <span class="ident">usize</span>,
    <span class="ident">caps</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;c</span> <span class="ident">Captures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">SubCaptures</span><span class="op">&lt;</span><span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>]<span class="op">&gt;</span>;

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>]<span class="op">&gt;&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">idx</span> <span class="op">&lt;</span> <span class="self">self</span>.<span class="ident">caps</span>.<span class="ident">len</span>() {
            <span class="self">self</span>.<span class="ident">idx</span> <span class="op">+=</span> <span class="number">1</span>;
            <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">caps</span>.<span class="ident">at</span>(<span class="self">self</span>.<span class="ident">idx</span> <span class="op">-</span> <span class="number">1</span>))
        } <span class="kw">else</span> {
            <span class="prelude-val">None</span>
        }
    }
}

<span class="doccomment">/// An iterator over capture group positions for a particular match of a</span>
<span class="doccomment">/// regular expression.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Positions are byte indices in terms of the original byte string matched.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;c` is the lifetime of the captures.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SubCapturesPos</span><span class="op">&lt;</span><span class="lifetime">&#39;c</span><span class="op">&gt;</span> {
    <span class="ident">idx</span>: <span class="ident">usize</span>,
    <span class="ident">slots</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;c</span> [<span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>]
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;c</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">SubCapturesPos</span><span class="op">&lt;</span><span class="lifetime">&#39;c</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;</span>;

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">idx</span> <span class="op">&gt;=</span> <span class="self">self</span>.<span class="ident">slots</span>.<span class="ident">len</span>() {
            <span class="kw">return</span> <span class="prelude-val">None</span>
        }
        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="kw">match</span> (<span class="self">self</span>.<span class="ident">slots</span>[<span class="self">self</span>.<span class="ident">idx</span>], <span class="self">self</span>.<span class="ident">slots</span>[<span class="self">self</span>.<span class="ident">idx</span> <span class="op">+</span> <span class="number">1</span>]) {
            (<span class="prelude-val">Some</span>(<span class="ident">s</span>), <span class="prelude-val">Some</span>(<span class="ident">e</span>)) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>((<span class="ident">s</span>, <span class="ident">e</span>)),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>,
        };
        <span class="self">self</span>.<span class="ident">idx</span> <span class="op">+=</span> <span class="number">2</span>;
        <span class="prelude-val">Some</span>(<span class="ident">r</span>)
    }
}

<span class="doccomment">/// An Iterator over named capture groups as a tuple with the group name and</span>
<span class="doccomment">/// the value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;c` is the lifetime of the captures and `&#39;t` is the lifetime of the</span>
<span class="doccomment">/// matched text.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SubCapturesNamed</span><span class="op">&lt;</span><span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span>: <span class="lifetime">&#39;c</span><span class="op">&gt;</span> {
    <span class="ident">caps</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;c</span> <span class="ident">Captures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span>,
    <span class="ident">names</span>: <span class="ident">hash_map</span>::<span class="ident">Iter</span><span class="op">&lt;</span><span class="lifetime">&#39;c</span>, <span class="ident">String</span>, <span class="ident">usize</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">SubCapturesNamed</span><span class="op">&lt;</span><span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> (<span class="kw-2">&amp;</span><span class="lifetime">&#39;c</span> <span class="ident">str</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>]<span class="op">&gt;</span>);

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;c</span> <span class="ident">str</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> [<span class="ident">u8</span>]<span class="op">&gt;</span>)<span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">names</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">name</span>, <span class="kw-2">&amp;</span><span class="ident">pos</span>)<span class="op">|</span> (<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">name</span>, <span class="self">self</span>.<span class="ident">caps</span>.<span class="ident">at</span>(<span class="ident">pos</span>)))
    }
}

<span class="doccomment">/// Replacer describes types that can be used to replace matches in a byte</span>
<span class="doccomment">/// string.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In general, users of this crate shouldn&#39;t need to implement this trait,</span>
<span class="doccomment">/// since implementations are already provided for `&amp;[u8]` and</span>
<span class="doccomment">/// `FnMut(&amp;Captures) -&gt; Vec&lt;u8&gt;`, which covers most use cases.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Replacer</span> {
    <span class="doccomment">/// Appends text to `dst` to replace the current match.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The current match is represented by `caps`, which is guaranteed to</span>
    <span class="doccomment">/// have a match at capture group `0`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// For example, a no-op replacement would be</span>
    <span class="doccomment">/// `dst.extend(caps.at(0).unwrap())`.</span>
    <span class="kw">fn</span> <span class="ident">replace_append</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">caps</span>: <span class="kw-2">&amp;</span><span class="ident">Captures</span>, <span class="ident">dst</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>);

    <span class="doccomment">/// Return a fixed unchanging replacement byte string.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// When doing replacements, if access to `Captures` is not needed (e.g.,</span>
    <span class="doccomment">/// the replacement byte string does not need `$` expansion), then it can</span>
    <span class="doccomment">/// be beneficial to avoid finding sub-captures.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// In general, this is called once for every call to `replacen`.</span>
    <span class="kw">fn</span> <span class="ident">no_expansion</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;r</span> <span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Cow</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, [<span class="ident">u8</span>]<span class="op">&gt;&gt;</span> {
        <span class="prelude-val">None</span>
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">Replacer</span> <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> [<span class="ident">u8</span>] {
    <span class="kw">fn</span> <span class="ident">replace_append</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">caps</span>: <span class="kw-2">&amp;</span><span class="ident">Captures</span>, <span class="ident">dst</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>) {
        <span class="ident">caps</span>.<span class="ident">expand</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="ident">dst</span>);
    }

    <span class="kw">fn</span> <span class="ident">no_expansion</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;r</span> <span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Cow</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, [<span class="ident">u8</span>]<span class="op">&gt;&gt;</span> {
        <span class="kw">match</span> <span class="ident">memchr</span>(<span class="string">b&#39;$&#39;</span>, <span class="kw-2">*</span><span class="self">self</span>) {
            <span class="prelude-val">Some</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">None</span>,
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">Cow</span>::<span class="ident">Borrowed</span>(<span class="kw-2">*</span><span class="self">self</span>)),
        }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span> <span class="ident">Replacer</span> <span class="kw">for</span> <span class="ident">F</span> <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">Captures</span>) <span class="op">-&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">replace_append</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">caps</span>: <span class="kw-2">&amp;</span><span class="ident">Captures</span>, <span class="ident">dst</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>) {
        <span class="ident">extend_from_slice</span>(<span class="ident">dst</span>, <span class="kw-2">&amp;</span>(<span class="kw-2">*</span><span class="self">self</span>)(<span class="ident">caps</span>));
    }
}

<span class="doccomment">/// NoExpand indicates literal byte string replacement.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It can be used with `replace` and `replace_all` to do a literal byte string</span>
<span class="doccomment">/// replacement without expanding `$name` to their corresponding capture</span>
<span class="doccomment">/// groups. This can be both convenient (to avoid escaping `$`, for example)</span>
<span class="doccomment">/// and performant (since capture groups don&#39;t need to be found).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;t` is the lifetime of the literal text.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">NoExpand</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span><span class="op">&gt;</span>(<span class="kw">pub</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;r</span> [<span class="ident">u8</span>]);

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">Replacer</span> <span class="kw">for</span> <span class="ident">NoExpand</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">replace_append</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, _: <span class="kw-2">&amp;</span><span class="ident">Captures</span>, <span class="ident">dst</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>) {
        <span class="ident">extend_from_slice</span>(<span class="ident">dst</span>, <span class="self">self</span>.<span class="number">0</span>);
    }

    <span class="kw">fn</span> <span class="ident">no_expansion</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;r</span> <span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Cow</span><span class="op">&lt;</span><span class="lifetime">&#39;r</span>, [<span class="ident">u8</span>]<span class="op">&gt;&gt;</span> {
        <span class="prelude-val">Some</span>(<span class="ident">Cow</span>::<span class="ident">Borrowed</span>(<span class="self">self</span>.<span class="number">0</span>))
    }
}

<span class="doccomment">/// This hopefully has the same performance characteristics as</span>
<span class="doccomment">/// Vec::extend_from_slice (which was introduced in Rust 1.6), but works on</span>
<span class="doccomment">/// Rust 1.3.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// N.B. Remove this once we do a semver bump. At that point, we&#39;ll bump</span>
<span class="doccomment">/// required Rust version to at least 1.6.</span>
<span class="kw">fn</span> <span class="ident">extend_from_slice</span>(<span class="ident">dst</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>, <span class="ident">src</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) {
    <span class="ident">dst</span>.<span class="ident">reserve</span>(<span class="ident">src</span>.<span class="ident">len</span>());
    <span class="kw">let</span> <span class="ident">dst_len</span> <span class="op">=</span> <span class="ident">dst</span>.<span class="ident">len</span>();
    <span class="kw">unsafe</span> { <span class="ident">dst</span>.<span class="ident">set_len</span>(<span class="ident">dst_len</span> <span class="op">+</span> <span class="ident">src</span>.<span class="ident">len</span>()); }
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dst</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">dst</span>[<span class="ident">dst_len</span>..<span class="ident">dst_len</span> <span class="op">+</span> <span class="ident">src</span>.<span class="ident">len</span>()];
    <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">src</span>.<span class="ident">len</span>() {
        <span class="ident">dst</span>[<span class="ident">i</span>] <span class="op">=</span> <span class="ident">src</span>[<span class="ident">i</span>];
    }
}
</pre>
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